Tropical Storm Nadine, which has spun in the open Atlantic Ocean for 15 days now, is the ninth longest-lived tropical system on record in the Atlantic basin. / Weather Underground

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The signs of the changing seasons are not just in the growing variety of colors on the horizon. They're everywhere if you look for them.

The two-day rain we endured on Wednesday and Thursday was more typical of November than September, but we'll be treated to some gleaming autumn weather now for, well, at least a day.

Friday will be fine, with sunshine and a seasonal afternoon high temperature of 68 degrees. Conditions will be ideal for Friday night football as well, if chilly. An upper-level low pressure center will bedevil us over the weekend, but shouldn't amount to much if any precipitation, and only a few clouds.

Its passage will usher in a reinforcing shot of cool air, however. After another high temp around 68 on Saturday, we may not get out of the 50s on Sunday. A streak of warmer-than-normal days in the low 70s appears likely for next week, although it may not last for long.

Another sign of the changing seasons can be found in the statistics below. For two consecutive days now the nationwide low temperature has been in Minnesota, not the mountains of the West. That's typical of the colder half of the year.

Tropical weather observers are tracking with interest Tropical Storm Nadine, which has spun aimlessly in the open Atlantic Ocean for 15 days now, and is poised to loop itself any day now. Nadine is a threat to nobody except perhaps residents of the Azores, but it's already the ninth longest-lived tropical system on record in the Atlantic basin, and likely to move up that list before it's done.

This weekend's full moon is commonly known as the famed Harvest Moon, being the full moon closest to the autumnal equinox.